In a dataset about bank customers applying for loan, data operations of different kinds are performed. Categorize the following operations into data retrieval, online analytic processing, or data mining:

a) Calculate the amount of interest to be paid by the customer if he decide to change the loan term from 5 years to 10 years.

b) Find if a customer with monthly income greater than 30,000 and own a house should be approved for a loan.

c) Find names of customers who didn't pay the monthly payment on time in the last year.